package com.ganbo.cloud.gateway.filter;

import com.alibaba.fastjson.JSON;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;

// @Order(-1)   #过滤器执行顺序，值越小执行优先级越高
@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {

    /**
     * @param exchange 请求上下文
     * @param chain    链(放行)
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 1.获取请求参数
        ServerHttpRequest request = exchange.getRequest();
        MultiValueMap<String, String> params = request.getQueryParams();
        // 2.获取参数中的 authorization 参数
        String auth = params.getFirst("authorization");
        // 3.判断参数值是否等于 admin
//        if ("admin".equals(auth)) {
            // 4.是，放行
            return chain.filter(exchange);
//        }
        // 5.否，拦截

        //返回通用json对象
//        ServerHttpResponse response = exchange.getResponse();
//        Map<String, String> data = new HashMap<>();
//        data.put("code", "401");
//        data.put("message", "非法请求");
//        byte[] datas = JSON.toJSONString(data).getBytes(StandardCharsets.UTF_8);
//        DataBuffer buffer = response.bufferFactory().wrap(datas);
//        response.setStatusCode(HttpStatus.UNAUTHORIZED);
//        response.getHeaders().add("Content-Type", "application/json;charset=UTF-8");
//        return response.writeWith(Mono.just(buffer));

        // 5.1.设置状态码
//        exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED);
//        // 5.2.拦截请求
//        return exchange.getResponse().setComplete();
    }

    @Override
    public int getOrder() {
        return -1;
    }
}
